US1784710A

US1784710A - Rear-vision mirror

Info

Publication number: US1784710A
Application number: US339875A
Authority: US
Inventors: Victor E Showalter
Original assignee: Elgin National Watch Co
Current assignee: Elgin National Watch Co
Priority date: 1929-02-14
Filing date: 1929-02-14
Publication date: 1930-12-09
Anticipated expiration: 1947-12-09

Description

Dec. 9, 1930. v, SHQWALTER 1,784,710

REAR VISION MIRROR Filed Feb. 14, 1929 Patented Dec. 9, 1930 UNITED STATES PATENT OFFICE VICTOR E. SHOWALTER, F ELGIN,. ILLINOIS, ASSIGNOR TO ELGIN NATIONAL WATCH COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS BEAR-VISION mason.

Application filed February 14, 1929. Serial No. 389,875.

This inventionrelates to improvements in rear vision mirrors, and more particularly concerns the construction of such a mirror of metal with a convex polished reflective surface.

One of the features of the present invention is the provision of a metal mirror which is made in a single piece embodying the polished mirror surface, means to stiffen and reinforce this surface, and means whereby the article maybe attached to a support.

Another feature of the invention is the provision of an integral metallic article having stiflening and attaching means incorporated therewith. I

An illustrative form of the invention is shown on the accompanying drawing, by way of example, in which Fig. 1 is a front elevation of the mirror. Fig. 2 is a top plan view of themirror. Fig. 3 is a side elevation.

In these drawings, the mirror is illustrated as having a reflecting surface 10, whichis preferably a substantially rectangular or ovular portion of a sphere, that is, it hasa greater angular dimension in one direction than in the direction at a right angle thereto. The illustrated form of the invention comprises an integral piece of metal having an arcuate front wall 11 substantially conforming to the surface 10, and upper and

lower walls

12, 13 whose free ed es extend chordally across the arc of this. ront wall 11 and stiffen and brace the same. Intermediate stifi'enin webs 14, which are preferably located ad acent the ends of the wall 11, may be provided between

walls

12, 13 and employed to support the article during production. The upper wall '12 is provided with an upturned flange 15 having apertures 16 therethrough for the reception of means whereby the mirror may be fastened on a vehicle or the like. It is preferred also to form the stiffening webs 14 with posts 17 having threaded apertures 18 therein by which the mirrormay be attached to a support; and by which a closing plate 19 may be fastened across the .con-

cave side of the article, if so desired, but it will be understood that the provision of such a closing plate is not essential.

The mirror may be constructed of sheet or cast material, and then the outer surface of the wall 11 is ground and/or burnished to form a segment of a spherical surface, and if a corrodible material is used for the body, it

is preferred to coat this surface with a resist-' ant metal such as chromium whereby its reflectivity is maintained. It will be understood that the surface may be made either.

totally or partially reflective to produce a more or less brilliant'image as desired.

, The metal mirror according to this .invensilver back glass mirror in that there is no Y double image.

It is obvious that the invention ma be practiced in other ways and for the ma ing of other shapes of mirrors than that illustrated and described.

What I claim is 1. A metal rear vision mirror comprising an integral arcuate reflecting wall and chordal reinforcing walls, one of said chordal reinforcin walls having a projecting flange whereby tile mirror may be attached to a support.

2.- A device as in claim 1, in which the arcuate wall is formed as a portion of asphere and provides a reflecting surface.

3. A rear vision mirror as in claim 1, in which intermediate webs connect the arcuate and closing walls whereby .to stiffen and brace the same.

4. A device as in claim 1, in which the arcuate wall is formed as a portion of a sphere, and has a greater angular dimension in one direction than in the direction at a right angle thereto.

5. A metal rear vision mirror comprising a unitary structure providing a convex arouate reflecting wall and chordal reenforcing walls, said arcuate Wall having a greater 10 width than height.

In testimo% whereof, I afiix In signature. CTOR- E. SHO ALTER.